Solid colloidal particles inducing coalescence in bitumen-in-water emulsions

被引：34
|
作者：
Legrand, J
Chamerois, M
Placin, F
Poirier, JE
Bibette, J
Leal-Calderon, F
机构：
[1] ISTAB, Lab Milieux Disperses Alimentaires, F-33405 Talence, France
[2] ESPCI, Lab Colloides & Mat Divises, F-75231 Paris 05, France
[3] COLAS, Cent Rech Lab, F-78771 Magny Les Hameaux, France
来源：
LANGMUIR | 2005年 / 21卷 / 01期
关键词：
D O I：
10.1021/la047649s
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Silica particles are dispersed in the continuous phase of bitumen-in-water emulsions. The mixture remains dispersed in quiescent storage conditions. However, rapid destabilization occurs once a shear is applied. Observations under the microscope reveal that the bitumen droplets form a colloidal gel and coalesce upon application of a shear. We follow the kinetic evolution of the emulsions viscosity, eta, at constant shear rate: eta remains initially constant and exhibits a dramatic increase after a finite time, tau. We study the influence of various parameters on the evolution of tau: bitumen droplet size and volume fraction, silica diameter and concentration, shear rate, etc.
引用
收藏
页码：64 / 70
页数：7
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